Calculator.



H. A. MBNSING.

CALCULATOR.

APPLICATION FILED Nov.2,1911.

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GLGULATE.

iiiecioation of Leners raient. atented Oct. l, 1912.

application :lied ioveniber 2, 1911. Serial No. 658,12*?,

all wwm ik nto/ i; concern:

Le it lrnovvn that I, Hmm f A. MENSING, vthe United States, residing at in the county of Monroe and eric, have invented certain proveniente in Calcula.- ne Jfollowing is specific ic invention relates to a ine' clianical calcuiating device, and has for its iinary object to provide a device of this character which embodies novel features of construction whereby the number of square feet in pieces of timber having various lengths and Widtlis may be readily ascertained.

A :turther object of the invention is to provide calculator Which is comparatively` simple and inexpensive in its construction," "which can be easily and quickly manipuated, Whichhas a comparatively Wide range of action, and 'which will enable the number ci? square feet in any given piece of timber te quickly ascertained.

fil'ith these nd other objects 'in View, the invention consists in certain novel combinaand arrangements of the part-s as Will more fully appear as the descriptioniproceeds, the novel 'features thereof being pointed out in the appended claims.

llor full understanding of the' invention, 4reterei/ice is to be had to the following description and accompanying drawings, in vvbicht# soure 1 is a top pian view of a calculator structed in accordance with the invenn, portions being broken away shown in section. i?, is a longitudinal sectional view on the line EZ-Z of Fig. 1, Fig. 3 is a c tional on the iine 3-3 a is a top plan view of a be empioyed in a device of this charactr Uorres'oond like Darts are referred L 1 l. to in the telic. -ng description and indicated in all the views of the drawings by the same reference characters. f

Specilically describing the. present em u bodiment of the invention, the numeral l "t ignetes a rectangular casinea which is b a Ln n top thereo'i with a iongiu i slot 2. This ,to the top of the easing 1 and extends along one oi the edges of the slot 2 so that the va* rions characters of the scale-can coperate with the characters upon the tabulated slide to indicate the desired results. In the preferred construction the scale i is divided into linch spaces which are consecutively numbered from left to right, 'the characters 5 of the scale being utilized to indicate the Width of the piece of timber.

The tabulated slide 3 is arranged under the top of the casing 1, the edges of the slide resting loosely upon ribs 6 which project from the sides of. the casing. The slide moves transversely with respect to the opening or slot Zand is provided at the middle thereof with a air of transverse ribs 7 which receive a rib 8 between them, the said rib 8 being carried by a batteri or Slat 9 secured to the bottom of the easing.l The slide is thus held securely against any lateral twisting or turning movement and supported adjacent the top of the casing 1, although the said slide is perfectly free to move in a direction parallel to the rib 8 and transverse to 'the slot 2.

An operating lever 10 is pivotally mounted at 11 uponthe bottom of the casing 1 the short end of the lever being provided with a segmental rack 12 which is concenf tric to the pivot 11 and is engaged by a inion 13 at the inner end of a shaft 14; w 'ch is journaled within one of the sides of the casing. The outer end of the shaft rojects upon the exterior of the casing w ere it is provided with a knurled finger ieee 15,

Attention may be directed to the tact that the segmental rack 12 is movable throu h a cut away portion 16 of the side of t e casing. the before mentioned pinion 13 being also received within this cut away portion of the side of the casing so as to prevent the saine from interfering in any manner with the action of the tabulated siide. The opposite end of the operating lever 10 is delected upwardly away from the bottom of the casing and 'connected by a link 17 to the slide 3, the said link being secured to the slide by means of a screw or pin 18.. With this construction, it will be obvious that by grasping the finger piece 15 and turning the same the operating lever 10 can be swung about its pivot 1i so as to quickly shift the tabulated slide 3 and bring the same into any desired position with .respect to the vievv slot 2.

The tabulated slide 8 of Fig. 1 and the tabulated slide 3a of Figf 4 are similar in construction, the only difference being that the slide `3a is slightly larger and would admit of a wider range of work. The tabular slide is provided at one edge thereof, in the present instanceat the left hand edge, with a column of figures 19 which serve to indicate the length of the piece of `timber in feet. ln F ig. 1 this series of figures eX- tends by the half foot from one foot to sixteen feet. The face of the tabular slide is divided by a series of lines into longitudinal spaces 20 corresponding to the various numerals of the column 19 and adapted to be brought successively under the view slot 2 so as to be visible through the same. Each of the longitudinal divisions or spaces 20 of the tabular slide is provided with a series Vof characters 21 which are peculiarly arranged and tabulated so as to coperate with the characters of the scale i to indicate the number of square feet in-the piece of timber. Assuming that it is desirable to find the number of square feet in a piece of timber sixteen feet and six inches wide. The slide 3 would be manipulated until the longitudinal division 20 thereon having the characterl 16 at the left hand end thereof were brought directly under the view slot 2,

this position being indicated in Fig. 1.

`That one of the characters -21 opposite the H character 6 of the scale 4i will indicate ythe answer to the problem. As indicated by Fig. 1, the numeral 8 of the scale 2l is brought opposite the Icharacter 6 of the scale li, thereby indicating that there are eight square feet in the said piece of timber. 1n a similar manner the number tlf square feet in any piece of timber having a length and width within the scope of the various scales can be quickly determined by movling the slide 3 until the character of the scale 19 corresponding to the length of the piece of timber 'is brought under the view slot 2, and then ascertaining that character 0f the scale 21 which is opposite ,the numeral of the scale et corresponding to the width in inches of the piece of timber.

For the purpose of holding the slide 3 against accidental displacement, a series of notches' 22 are formed in one end of the slide, the said notches being adapted to be engaged by a nose 23 at one end of a spring strip 24 which is let into a side of the casing. This spring detent which coperates with the notches does not prevent the slide from being forcibly moved when the finger piece 15 is turned, although the slide is held against accidental displacement.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:-

1. In a calculator, the combination of a flat casing having a View slot in the top thereof, a tabular slide mounted within the casing so as to have various portions thereof broughtunder the view slot, an operating lever pivotallyl mounted within the casing and provided at one end thereof with a segmental rack, a pinion engaging the rack, a

vshaft carrying the pinion and extending tions thereof brought under the view slot,V

an operating lever pivoted between its ends within the casing and provided at one end thereof with a segmental rack movable through the cut away portion of the side of ...the casing, a binding arranged within the eut away portion of the side of the casing and engaging the rack, a shaft rigid with the pinion and extending through the casing, a finger piece applied to the outer end of the shaft, and a link loosely connecting the opposite iend of the operating lever to the slide.

3. In a calculator, the combination of a flat casing having a slot in the top thereof and provided at its sides with inwardly projecting ribs, a batten applied to the bottom of-the casing and provided at the top thereof with a rib, a tabular slide having the ends thereof resting upon the ribs at thesides of the easing and provided with a pair of downwardly project-ing ribs fitting upon opposite sides of the rib upon the hatten, the said tabular slide being movable to bring different portions thereof under the view slot, a main operating lever pivoted between its ends upon the bottom of the casing and provided at one end thereof with a segmental rack, a pinion engaging the said rack,

a shaft rigid with the pinion and passing through the casing, a finger piece applied to the outer end of the shaft, and a link loosely connecting the opposite end of the lever to the slide.

4. Ina device for calculating the number of square feet in a piece of timber, the combination of a flat casing having a slot in the top thereof and provided at its sides with inwardly projecting ribs, a scale arranged at one edge of the view slot and having characters thereon adapted to indicate the width of the piece of timber in inches, a slide arranged within the casing and mounted upon the before mentioned ribs, the said slide being provided at one end thereof with a transverse series of characters adapted to indicate the length of the piece of timber in feet and' arranged to be brought successively under the view slot as the slide is moved, the said slide being formed with a longitudinal scale for each character of the said transverse series of characters, the longitudinal scales being brought under the view slot simultaneously With the characters of the transverse seriesl and cooperating With the scale at one end of the View slot to indicate the square feet Contained by a piece of timber having the length in feet indicated by that one of the transverse series of characters Whichv is visible and the Width indicated by the scale at the edge of the slot, an operating lever pivoted at its ends upon the bottom of the casing and provided at one end thereof with a segmental rack, a pinion engaging the rack, a finger piece rigid with the pinion, and a link loosely connecting one end of the lever to the slide.

5. In a calculator, the combination of a vand a link loosely connecting the flat easing having a slot therein, a tabular slide mounted Within the casing and movable to bring different portions thereof under the view slot, the said slide having a series of notches in one end thereof, a spring strip applied to the easing and provided with a nose adapted to engage the notches to hold' the slide against accidental movement, lever pivoted between its ends upon the easing and provided at one end thereof with a segmental rack, a pinion engaging the rack, a fingery piece rigid With the pinion, opposite end of thelever to the slide.

In testimony whereof I aliX my signature in presence of two Witnesses. y

HENRY A. MENSING. Witnesses:

) WM. H. IIEINTZ,

AUGUST J. DENTINGER. 

